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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2f5a9654b4e073226580cf9d00acae1e65dd21263f008ba246746d796eeed2' 
  AND token = 't86LIU3ZDyMDkQ6rfJkAn3u4STYlQkIzqLGYUiUFpnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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