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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157d5484ada25b9376f2d2ffcaf4681f1285d7419de598e8e83662ebf522f124' 
  AND token = 'Z2v5CXjZq+U+cjzjJwysB196uf2B+d62vpIlCt+RceU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}