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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e06f51eb6d934cab7a18a9e7ebf3d88631540278db6ef9538d5074ac96a758' 
  AND token = '5ch0ODBf3NFNbKWdtXE++UvP+SWPfQ9tyn3Tvog8n/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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