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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284d5b86961ba92acc34bef4347f4a404e28f60978f3aebd0cb8833d38f6cca1' 
  AND token = 'uzLmYLKWb9Vx2+fDxTJWs1SUXWZcPsO4sfAL9BjueW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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