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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '427bb2e6541800c462740cd031928734dc147dcf3e1ed869d6e2fdfdff053217' 
  AND token = '1Mo8Yv90hrV6XcLCb0mufVxHFYK2UxF9H1q24A6wSGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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