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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd1bbc418684ea0a43403b15a1b34307979169b7b9f1620535c41e09c533c3c' 
  AND token = 'zRrQ7K+kXWXDFzFoswX0/de3JTh4InPG3uUUsZp+SfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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