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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd490da613a1038ad850e724f1b93fa14ffc558baa3aa0e769f85ce5730412265' 
  AND token = 'fj1ImqMKbYH0P0M0HF6U676yc/geIKV/+hVxuF+rUvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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