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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ed08e762821325fe644e00328831dd1ed72ab3118d61f54852e154f8e18e6f' 
  AND token = 'ZVud25Ai2GYcLZoe1MZ9zGttyHM3jFhoq5KP1fy0i8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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