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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fed4c745e30942e153d39997740b5451bae6b7fcce1431897b9d0d94b65ec05' 
  AND token = 'Ij5jKotpGTasUe+ZmoGikZdPFlsep8zCGbA+SQAiHN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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