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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce4950690ed6ef6bc42d1adbb1a8fc6b918fabeec40a6598d5ef1aa7ab9348d' 
  AND token = 'mTEf3gBHzUChgj7yqPzmM3nJBC1gYP9Vvv0PeiPXcdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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