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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f558252f3893c663f23d4db0930cbd74f31aa78695a57b791d0afac88b646ad1' 
  AND token = 'U8Yq63NyULaes3ASpntaDyQshFBsrXz5E4yvDNXU9Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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