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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c13a697f1dd7fe175bd6dceed3827b624833c4a5739c145b28398ce1c345e1f' 
  AND token = 'g2rUi+PGt3ikJA/838enSy0ptt308zbKTS4P1zOZ+gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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