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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bcdd53f8b8e365fb51789a356f457bc2c0e87351be3cec0780f3c5fefefe45' 
  AND token = 'kFggK0b8Cb9jVzq17chZ96BSYElxy9Ejdf1Tsp+Y8Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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