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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad6c896195cb917965b1645b4c0a402583d173be9e2313010dcb7f5e47a449a' 
  AND token = 'AEFTzfmZyazu/fOKpXsc8ZQhdJNYIoee2ixoa89Zj7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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