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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabfd2691862a9bec8e468131e07b7e137c4949ce8e036effc7acb7a613c082e' 
  AND token = 'KicmtgvwL/E1vYP1azBs6D1QITQ7dPZD3XO2Ts8ojks=' 
  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"
    }
  }
}