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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190924c823b502adc80769890f3785c115174e67b30b4bf5014997634798b647' 
  AND token = 'ShMwPBYGcOs7DB5v70k8hFUG9UHsoSNfm6P7jvXpxW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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