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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324f4127197be785fea54f38a4ba9a2d4dfb40724f04a44e57da0b282afb75f7' 
  AND token = 'XwAlbxntCoEzpBhrbgcXa+G2ao8aZ+a4UWmT+CymlQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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