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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ddc1ac005ebf2fcdd93220c2c0963102b9f59ff6e3d93d0ff331d9d8503ddd' 
  AND token = '8edIpfso0ULFQav4lfJZBdu0SalMNshvKCdQyMs/u24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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