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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30664613cd22fa00f753489aee72cef93fafcfe0259b51bb737677ccce409a5' 
  AND token = 'SDuL2pL2EFreE/gJevK3p9I2V6+eSasdKQFKsucixzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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