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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7249e44405ec1fa5d06315154b8a237992049f6822ffeaf13971a572cb925aa2' 
  AND token = '2BkF1KZ3GEVvI0mvZUrUU2Wt4rs8I4d9pkKWsbRMQug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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