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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d49b1be73a27ee5d1ba01fe514da36de3f01d45ec641b3ba2f88ed7d9e48f18' 
  AND token = 'FPIA1G1TSSD/igod5MvBGm8l19MDOMioXffVoHA8ok8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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