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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a762e1c6420cf362c3c40150273c79d1b8d47ea95aa44ce967411662a1e32d' 
  AND token = '5ZOiSGRYcfefwqVHDJPSpRc7bJ7ic5rUPxrXwbdVyOU=' 
  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"
    }
  }
}