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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef740af70b5e77c68c1c0855fcf8689cec6d0fc536d2bd06e7e13aaffc59bce' 
  AND token = 'KzcwS5qrtPIHI1GDvj6wmjPuVr03YnMu/qw27iFHpPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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