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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd727d84748089e30c5d4a30c3b8924cafee843c30cfe26734726c3ba810ee51' 
  AND token = 'snXKZQQFpjsMsgPr7hoKZ2XW7pd6HTQPjWRiWQNfvQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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