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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960f467a368d9c5cf7f4fed7df6337a92e73c7e9cc41c003bb457e4cb9c2cc36' 
  AND token = '7rHKWgmiJ17KnY7YFpzEmNj6nl56I9xdndFQLQeEZe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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