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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fe721b2278d6a0e3d1fca7ff944a73c2418cf4acc12e62dd1772f30354241e' 
  AND token = 'ZiB1N5VnLs7Fru9hhbO2IYfBivA/VTPO2CVtjzOjGlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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