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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1023f74cb48dab36d1989132fa75f47ae5f3d64e04107d9f9ab4001aeaf0e94f' 
  AND token = '54aP8vcU/cPEK4xHkQ4LP+Cu+CLU1oqq+Kg5kEn11ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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