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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415a055dc85a7c6a88d9530a464da4ffbba614d1098e77b375a18d6fd3e239b3' 
  AND token = 'syTEpZo+7xWpw79OBLn+llpp4LsihfbJcd3Fia8emAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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