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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2d7d01fbf9c7b03fe7ef434c68b8d3c3bbd5666f521fe7d785530c360fadad' 
  AND token = 'LE9cB5zJJqrRKhJR5JbtU3uvmnnvH04pL/77bp6i/cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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