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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f36e84854feceefbda8a8b64bc13a3e4b2885f964f01c7756e04d883245a53e' 
  AND token = '5cV6RST8/sp//u1iuOTfgQEfBK4w3ZcOjO8quH1Ld14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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