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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3dd0bcac3c4ea54a1ffeb13031588a358db2b61cc0d2c0d45a3e70e6addfbca' 
  AND token = 'd2ILjA3KKXBmgebQ3ewHVmehVtyHt6zB2TVm9RvVK2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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