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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173a0963a743d8a4fecb20b3a6b4003e3d48dc6b3467baacca16f822f07bb36e' 
  AND token = 'tK2Iz1+YRwq++Hp+I/eTn9UYZpQ80LrKjZkeG2QsCJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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