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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2811baf62b617e735000069a829bbf7b44572bb8f3ccba1b63a3f417033583b0' 
  AND token = 'Ucn+D+5u5+OJ2xbl04oKNfUSbCXu4gC0s4lgDOldv50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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