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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd264dbb55e01f69e3506c5c677028f455582593631f95ecebba20c559a42e25e' 
  AND token = 'WKU/ci5b3riKmosROt4oy8y1nd5YMoy34oQ+uHzDwJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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