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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd00bb6375f05e51c46631cbaf0b1f492e16961b921635f28163c0eed48518e' 
  AND token = 'hGp3DhjuiOXVeDsMFp/UqqTOU7ThRtPUnDA7mnhl8Jw=' 
  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"
    }
  }
}