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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc86e4a8d908bf882f94a8dfb2f3f27491bc29fc929d7d9678c5e7423e320cd5' 
  AND token = '5AmkFak44qp8hCDT0MbN+eEOI9SMQ+7dDc3/B1PlmzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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