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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c01925b21d019f54b7cc6f982694ab8c08f5f1fe415c44e478d6c7fa9b4ac7' 
  AND token = '7BSHRitco70wz+OQj5tKstUfQ9raRdq7JuRv3+3nv5c=' 
  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"
    }
  }
}