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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17b17ac98a1760be9f6e8ead009d5e204596f08c815c1d92e610c28e1551907' 
  AND token = 'hadUb6nO4UJgJVRabbsPyy6FhrIFto2H7mjCkfyq9Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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