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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024522e8c4bbc492095c6b83467b2ccd023c595b007102ae6253de7096d7242f' 
  AND token = 'tvvenA6G8VZzYjI/F8iRQr+XV25ndnbo4STR2GaZrcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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