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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0702473d4a0c0ac7b4630a7b9f72598839ad70266a6aa2629850f45d5a70ca' 
  AND token = 'dIcM7C7U7VfA7uOTssFi8GY5HqwErksFPWy26B33Sp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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