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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59775fde20e3e61b9147fb5cece29eec2636c32dd96813ccf0a87eb4da21629c' 
  AND token = 'ZxQ3ZhYpOHYdd0FY1pxtm2rREGHFB0Xgps/YSQvyfS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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