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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef442fd5b1dd25f3cc386be308dc909e27598824119fea98a811bc6bf8e2cce8' 
  AND token = 'JsP/8t7u8cWDmB1Os7gwJHD79wKoAWG1ls5pOG3AN/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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