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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af649523ae00759ce4c97256452ab784761a2aec2e9de911521f58e8ef8d8acd' 
  AND token = '+5L0OmHoU1OCv86FMwJtPn8hetA+YQfxsrhT/R7ldpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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