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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c72240f6f1f877b87356e9565e9569979049a923ac75ae21a69cfed59e4d68' 
  AND token = 'QxV+CKuaE64SDLj7a5U8Xtpe3drlm5rlQ7Gp0PeKXr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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