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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860d93b8ab4e8a58cfd5412ffc6dac8d8c41f36cf3bcf77c452148376e274e6d' 
  AND token = 'cK9MTpidFnE4o/5KR110aT1x9WcpN0/+Dokw12DagMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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