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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b59572b6cbafcb95757c80ea0ba0ec420adecb50ed287775934c7669f0b2f0c' 
  AND token = 'cD9IdnXDIZm1h4+xxGRTvEBMu6LKSyWFlaxmKK3nr3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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