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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cd283d6d5fa6eed90a2c76dd9c5b192e290340daae63d4e8285eff8eb7f808' 
  AND token = 'vzQSn0pIoHWbqFWe9ZkIO6F8bWM0pOp+Ko5AFTZc5oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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