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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5a4cf852ee8351be73dd783ab427fc726ebef7bfcb6e27fb50634d922d5708' 
  AND token = 'EGeKE4T74110XncuhJY2+Zpjl0hp0WxzAuHzGUDHNz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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