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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14b901c6967f57c647b453e290f1f4bb1a15045d0dbeeddc5c6edb8c15084f9' 
  AND token = 'nclfcsc+YoFeBEzwtx5ydEz0S/ODnqb+L0et5q2xmBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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