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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b5073ba93926817b7828477434d45fe6e269a31c5b1b83346980de5773ca04' 
  AND token = '88aSpGz32Muj28svpaKoLOVKK8Vo7OF8DaxXRT/Xf4M=' 
  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"
    }
  }
}