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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59eece32609772c933fb884ce246c2dea9c2c5e3d2680230f6ef2c7bc6bb24ce' 
  AND token = 'y8THbCyCE5WJS2JBEkF1RhgrffEsl7qRYj4yJM5A3Ec=' 
  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"
    }
  }
}