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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875f12fbd15b055707e4324665d0d365a21e4f17926d70215b9e1fb0fd700915' 
  AND token = 'KQE0X55kCJKzjoPsbDlv/c7zt1RvWs3XolKzbEirTzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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