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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8f27e235497edfd9b54528ffd0e2b8179da675b796a05e0e0514d3767f3384' 
  AND token = 'RfbepiEptlxfmUttg8Zj6kC8TGVQ5+cBYnIgBbQn+6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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